Hey Sarah
The minimum cage size I would recommend for 2 gliders would be 2x2x3 feet. The space between the bars needs to be 1/2 inch or less. Thatcage is a little bit to small. We sell cages, but are not set up to ship yet. We finally found a box big enough, but now we have to get it weighed and see how much it would cost to ship them.
We do sell supplies though if you want to check our store out
www.thesugargliderstore.com and have a look at our other website
www.critterhill.com and you can find lots of information about Sugar Gliders there.
What diet were you going to feed? We use BML and our Sugar Gliders love it.